platformName - Platform name

機能/意味: Platform name
タイプ: Systemクラスのプロパティ (読み出し専用)
説明: 　The name of the platform on which Kirikiri is running. For Windows, it is 'Win32' when the OS is 32bit, and 'Win64' when it is 64bit.
　For 1.3.0 or earlier, it is always 'Win32'.

System.platformName